856377631 has 4 divisors (see below), whose sum is σ = 856464192. Its totient is φ = 856291072.

The previous prime is 856377623. The next prime is 856377661. The reversal of 856377631 is 136773658.

856377631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 856377631 - 2³ = 856377623 is a prime.

It is a super-2 number, since 2×856377631² = 1466765293754344322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856377661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26191 + ... + 48976.

It is an arithmetic number, because the mean of its divisors is an integer number (214116048).

Almost surely, 2^856377631 is an apocalyptic number.

856377631 is a deficient number, since it is larger than the sum of its proper divisors (86561).

856377631 is a wasteful number, since it uses less digits than its factorization.

856377631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86560.

The product of its digits is 635040, while the sum is 46.

The square root of 856377631 is about 29263.9305459810. The cubic root of 856377631 is about 949.6314843987.

The spelling of 856377631 in words is "eight hundred fifty-six million, three hundred seventy-seven thousand, six hundred thirty-one".